Thu. Jul 18th, 2024
Process of HDPE Blow Moulding Machine

HDPE Blow Moulding Machine, also known as High-Density Polyethylene Blow Moulding Machine, is a type of manufacturing equipment used to produce hollow plastic products, such as bottles, containers, and tanks, from HDPE resin. It utilizes the blow molding process, which involves inflating a molten plastic parison (hollow tube) inside a mold cavity to form the desired shape.

Today, in this article, we’ll discuss the working process of the HDPE Blow Moulding Machine, its components, and its benefits. 

What Exactly Is HDPE Blow Moulding Machine?

HDPE is the most popular plastic for use in the blow moulding technique. This thermoplastic is unmatched because it is made up of a string of ethylene molecules that make it robust while being lightweight. HDPE is also ecologically friendly, therefore it fits the purpose of many businesses that want to use environmentally friendly materials.

HDPE Blow Moulding – The Process Explained!

The process of HDPE Blow Molding involves shaping a softened thermoplastic hollow form, known as a Parison. Initially, the Parison is extruded vertically from the die head of a Blow Molding Machine. Subsequently, it undergoes inflation against the cooled surface of a closed mold. As a result, the expanded plastic material solidifies, forming a finished hollow HDPE product that often requires minimal or no additional finishing processes.

Blow Molding using HDPE plastic yields a wide range of products available in the market today. Some common examples include plastic bottles used for cleaning agents and lubricant oils, jerry cans designed for edible oils, water tanks, and drums for chemical liquids.

Here is the HDPE Blow Moulding Machine working process explained step by step:

Material Preparation

HDPE resin is fed into the machine’s hopper, where it undergoes heating and melting processes to transform it into a molten state. The molten HDPE is then extruded through a die to form a continuous hollow tube called a parison.

Mold Clamping

The parison is clamped between two halves of a mold. The mold is designed with a cavity that represents the final shape of the product.

Inflation and Molding

During this procedure, the parison undergoes expansion as compressed air is introduced, enabling it to adopt the contour of the mold cavity. The application of air pressure persists until the molten HDPE fully adheres to the desired shape of the mold.

Cooling and Solidification

After the desired shape is obtained, cool air or water is circulated through the mold to cool down the molten plastic and facilitate its solidification. The cooling time varies depending on the size and thickness of the product.

Mold Opening and Product Ejection

After the plastic has hardened, the mold is unlocked, and the freshly shaped product is released from the machine. Subsequently, the process is prepared for the subsequent cycle.

Types of HDPE Blow Moulding Machine

Extrusion Blow Moulding Machine

This is the most widely used type of HDPE blow molding machine. It involves melting HDPE resin and extruding it through a die to form a hollow tube or parison. After clamping the parison into a mold, the air is injected, causing it to expand and take on the form of the mold cavity.

Injection Blow Moulding Machine

This particular machine integrates both injection molding and blow molding procedures. To begin with, a preform is created through injection molding using a dedicated machine. Subsequently, the preform is moved to the blow molding machine, where it undergoes reheating and stretching before being blown into its ultimate form.

Continuous Extrusion Blow Molding Machine

This type of machine is used for the continuous production of HDPE products. It involves a continuous extrusion process where the HDPE resin is melted and continuously extruded through a die to form a continuous parison. The parison is then clamped into a mold, and the blown product is continuously ejected while the next parison is formed.

Rotary Blow Molding Machine

This machine utilizes a rotary mechanism to improve production efficiency. The molds are mounted on a rotating carousel or wheel, allowing multiple molds to be in different stages of the blow molding process simultaneously. This enables higher production rates compared to other types of machines.

Main Components of an HDPE Blow Moulding Machine


The extruder is responsible for melting the HDPE resin and forming the parison. An extruder in a moulding machine consists of a barrel, screw, and heating elements. The screw pushes the resin forward while the heating elements melt it.

Die Head

The die head is located at the end of the extruder and shapes the molten HDPE into a parison of the desired size and thickness. It has an adjustable opening known as the die gap.

Clamping Unit

The clamping unit holds the mold halves together during the blowing process. It consists of clamping mechanisms, guide rods, and a hydraulic or mechanical system to apply and release the clamping force.

Blow Molding Station

The blow molding station includes the inflation system, which supplies compressed air to the parison, and a blow pin that assists in shaping the plastic inside the mold.

Cooling System

The cooling system helps in solidifying the plastic product. It can involve cool air fans or water channels that circulate coolant through the mold.

Control System

The control system comprises electrical and electronic components that manage and monitor the machine’s operation. It includes temperature controllers, timers, sensors, and an operator interface for adjusting parameters and settings.

What Are Several Benefits of a HDPE Blow Moulding Machine?

It’s Affordable and Efficient 

HDPE is a cost-effective material compared to other plastics, such as Polyethylene Terephthalate. HDPE blow molding machines enable efficient production processes with low material waste, resulting in cost savings for manufacturers. Just make sure to buy this product from one of the reputed HDPE Blow Moulding Machine Suppliers in India.

The Machine is Durable

HDPE is known for its excellent strength-to-density ratio. Products manufactured using HDPE blow molding machines exhibit high strength, durability, and impact resistance. This makes them suitable for demanding applications and ensures product longevity.

It’s Lightweight

Despite its strength, HDPE is a lightweight material. This characteristic is advantageous for applications where weight reduction is essential, such as automotive components or packaging materials. Lightweight products also contribute to lower transportation costs.

It’s Eco-Friendly  

HDPE is a highly recyclable plastic. The use of HDPE blow molding machines promotes sustainability by enabling the production of recyclable products. Additionally, recycled HDPE can be used to manufacture new products, reducing the environmental impact.

The Final Verdict

HDPE blow moulding machines have transformed the plastic packaging and manufacturing industry, providing cost-effective, versatile, and environmentally friendly solutions. 

If you’re looking for high-quality HDPE blow moulding machines, Allied Way India is the best choice. 

As one of the top HDPE Blow Moulding Machine Manufacturers in India, we design and manufacture our products with high-quality components. 

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